The black and gray market is all on the Tron network, and Tether and Sun both know that the more U they use to enter the market, the more it inflates. Those people's U is mostly circulated cash trading among themselves, rarely entering exchanges or crossing over to other chains, contributing nothing to Web3, and not having a significant impact on the community. It's simply a laundering tool, so Tether only needs to inflate to keep making money. Those people only recognize USDT and only play on Tron, Tether and Tron are indirectly supporting the black and gray market, as there's no risk and high profit. The transaction fees on Tron are shockingly exaggerated, after all, it's normal for you to charge some fees for this kind of operation, right?